Comparison of cyclic nucleotide phosphodiesterase isoforms from rat heart and bovine aorta. Separation and inhibition by selective reference phosphodiesterase inhibitors

Biochemical Pharmacology
A F PrigentJ C Stoclet

Abstract

The resolution as well as the biochemical properties of the multiple molecular forms of cyclic nucleotide phosphodiesterase, in a given tissue, may be strongly dependent upon experimental conditions of preparation (extraction of crude enzyme from tissues and fractionation procedures). In the present study, we compare the different molecular forms of cardiac (rat heart ventricle) and vascular (bovine aorta) phosphodiesterase isolated from crude extracts prepared either in sucrose medium or in hypotonic medium (in the presence of protease inhibitors and ion chelators) using two different fractionation procedures: isoelectric focusing on flat gel bed and DEAE-Trisacryl anion exchange chromatography. Both the calmodulin-dependent and the cAMP-specific forms exhibited close IEF and chromatographic patterns and showed similar sensitivities towards reference inhibitors regardless of the tissue of origin. In marked contrast, the cGMP-specific isoform notably differed from one to another tissue with respect to its biochemical properties (only the cardiac tissue being capable of stimulation by cGMP) and sensitivities to xenobiotics. Thus the possibility exists that pharmacological agents may modulate phosphodiesterase activity differentl...Continue Reading

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Related Concepts

Cyclic AMP, (R)-Isomer
Metazoa
Ascending Aorta Structure
Bos indicus
Ion-Exchange Chromatography Procedure
Cyclic GMP
Isoelectric Focusing
Myocardium
Phosphodiesterase Inhibitors
2',3'-Cyclic-Nucleotide Phosphodiesterases

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